JPH0536599Y2 - - Google Patents

Description

[Detailed description of the invention] <Field of industrial application> This invention is a method for assembling the large end (upper metal, lower metal) of a connecting rod to the crank pin of the crankshaft of a large internal combustion engine. Regarding equipment.

<Prior Art> Conventionally, the crank pin of the crankshaft of an internal combustion engine, especially a large diesel engine, and the large end of a connecting rod have been assembled by the following method. That is, in order to support the journal portion of the crankshaft, they were suspended and transported by a crane onto frames of the same height that were erected in a row on the floor at predetermined intervals. Place the crankshaft and clamp it to this frame. Next, a roller conveyor is placed on the floor below the crank pin position of the crankshaft so as to be perpendicular to the crankshaft, and the lower metal of the large end of the connecting rod is lowered and placed on the transfer platform on the roller conveyor using a crane. ,
Push this lower metal together with the transfer table by hand to move it to just below the crank pin. Next, the crane is positioned above the crank pin, and two wire ropes of the same length hung on the hook of the crane are lowered to the floor across the crank pin, and the ends of both wire ropes are lowered. After passing through the bolt holes on both sides of the lower metal from above and attaching retaining metal fittings to their tips, the hook is rolled up to bring the lower metal into contact with the crank pin from below. In this state, a jack is tightly inserted between the lower end of the lower metal and the floor surface to support the lower metal, while the retainer is removed and both wire ropes are pulled out from the bolt holes. Thereafter, the upper metal is lifted and moved by the crane, and placed on the lower metal from above so as to sandwich the crank pin, and is inserted into the stud bolt of the upper metal that passes through the bolt hole of the lower metal and protrudes from the lower end. A nut is screwed on to connect the upper metal and lower metal.

<Problems to be solved by the invention> However, in the above conventional method of assembling the big end of the rod, two wire ropes of equal length that straddle the crank pin are used to connect the lower metal through the bolt holes on both sides. In addition, since there is little margin for the distance between both bolt holes relative to the crank pin diameter, if the lower metal, crank pin, and crane are not placed exactly on a vertical line, the wires will come into contact with the crank pin during lifting. There is a drawback that only one of the ropes is pulled up and the lower metal swings violently, causing the wire rope and the lower metal to collide with and damage the crank pin and crank journal. Especially in large diesel engines with a piston diameter of about 400 mm, the weight of the lower metal mentioned above is
Damage to the crank pin, etc. caused by a collision with the lower metal, which can reach up to 80 kg, not only causes a serious defect in the diesel engine, but also makes the assembly process itself extremely dangerous. However, the only way to overcome this drawback is to precisely place the lower metal, crank pin, and crane one after another on the vertical line. Inserting and removing the wire rope that goes down on both sides of the lower metal through the bolt holes on both sides of the lower metal, attaching and removing the stopper to the tip of this wire rope, and moving the crane that hangs the lower metal takes time and reduces work efficiency. This results in a large amount of time being spent on setup before assembly.

Therefore, the purpose of this invention is to provide a simple lower metal hanger to safely and efficiently attach the lower metal and upper metal of the large end of the connecting rod to the crank pin of the crankshaft without damaging the crankshaft due to collision. It is an object of the present invention to provide a jig device that can assemble.

<Means for Solving the Problems> In order to achieve the above object, the rod large end assembly jig device of the present invention places the journal part of the crankshaft immovably and horizontally holds the crankshaft. a large connecting rod that has a U-shape consisting of an upper side, a middle side, and a lower side, has a hanging part for the crane on the upper side, and has a side surface in contact with the middle side. A lower metal hoist has a pin on the lower side that fits into the bolt hole of the lower metal at the end from below, and the lower metal hoist is held by the lower metal hoist and lifted by a crane from below the crank pin of the crankshaft. and a jack inserted into the lower end of the lower metal brought into contact.

<Operation> First, the crankshaft is lifted up by a crane, and the journal portion is immovably placed on a pedestal to support the crankshaft horizontally. Next, fit the pin on the lower side of the lower metal hanger into the bolt hole of the lower metal of the large end of the connecting rod from below, and also bring the side surface of the lower metal into contact with the middle side of the lower metal hanger. While holding the lower metal of the lever on the lower metal hanging tool, lift and move the upper part of the lower metal hanging tool with a crane, and bring the lower metal into contact with the crank pin of the crankshaft from below. . In this state, insert a jack into the lower end of the lower metal to support it, move the crane to evacuate the lower metal hoist, and then lift and move the upper metal with the crane to tighten the crank pin. It is sandwiched and placed on the lower metal from above to connect the upper metal and the lower metal.

<Example> Hereinafter, the present invention will be explained in detail with reference to the illustrated example.

FIG. 1 is a side view showing an embodiment of the present invention, in which 1, 1, 1, 1 stands on the floor F and stands of the same height are erected in a row at predetermined intervals, 2 stands for these stands 1,
1,... on which the journal parts 2a, 2a,... are immovably placed and a horizontally supported crankshaft; 3, a U-shaped lower metal hanger (see Fig. 2); 4;
5 is a wire rope that suspends this lower metal hanging tool 3 from a crane (not shown) via an eye bolt 17 at the tip of the upper side 11; , the crank pins 2b, 2 of the crankshaft 2
The lower metals 6 and 6' of the large ends of the connecting rods that are brought into contact with b, ... from below are threaded jacks 7 that are inserted into the lower ends of the lower metals and support the lower metal 5.
is the upper metal of the large end of the connecting rod which is placed on the lower metal 5 from above with the crank pin 2b in between and connected to each other.

As shown in FIG. 2, the pedestal 1 is made of shaped steel assembled into a table shape, and has a semi-cylindrical abutment plate 1a fixed to its upper surface that abuts the lower half of the journal part 2a. It is equipped with a clamping means (not shown) for clamping 2a. The crankshaft 2 supported by this frame 1 is for a 6-cylinder (cylinder diameter 400 mm) diesel engine.
The pair of crank arms 2c are fixed in order around the journal part 2a at a crank angle of 120°, as indicated by the arm numbers in parentheses in FIG.
A crank pin 2b is fixed between each pair of crank arms 2c. Therefore, the screw jacks 6, 6' supporting the lower metal 5 which is brought into contact with the crank pin 2b from below are inserted into the floor F on the vertical line passing through the center of the crank pin 2b.

FIGS. 3a and 3b show a front view and a side view, respectively, of the lower metal hanging tool 3 having a U-shape. This lower metal hanging tool 3 is made by bending groove-shaped steel at right angles to form an upper side 11 and a middle side 12, and a reinforcing material 1 at the corner.
At the same time, a small rectangular lower side 13 is fixed to the lower end of the middle side 12 and parallel to the upper side 11, and the pins 15, 15 are attached upward to the lower side 13. On the other hand, the upper side portion 11
A female thread 16 for an eye bolt 17 (see FIG. 2) is screwed at the tip, and a protection plate 18 made of nylon is further adhered to the inner surface of the upper side 11. As shown by the two-dot chain line in the figure, pin 1 of the lower metal hanging tool 3
5 and 15 are bolt holes 5a and 5 on one side of the lower metal 5
a from below, the lower side part 13 contacts the flat part 5b at the lower end of the bolt hole 5a, the inner surface of the middle part 12 contacts the side surface 5c of the lower metal 5, and the lower metal hanger 3 5 is held securely. In addition, the dimensions and weight of each part of the lower metal hoist 3 are as follows: When the lower metal hoist 3 is held in this manner and the lower metal hoist 3 is lifted via the eye bolt 17 and the wire rope 4, the dimensions and weight of the parts around the eye bolt 17 are In order to balance the moments, the distance between the upper surface of the lower metal 5 and the upper side 11 is adjusted so that the crank pin 2
It is designed to be slightly wider than the diameter of b. The screw type jacks 6, 6' have high and low jacks, respectively, depending on the height of the crank pin 2b, and are threaded rods with nuts 6b, 6'b screwed onto the ends of the pipe bodies 6a, 6'a. 6c, 6'c
Screw in the bottom plates 6d and 6'd to the lower end of the pipe body.
simple and lightweight (6
(kg, 2kg), and the stroke of the threaded rods 6c, 6'c is approximately 60mm.

Next, the direction of assembling the large ends (upper metal 7, lower metal 5) of the connecting rod to the crankshaft 2 using the above jig device will be described with reference to FIG.

The crankshaft 2 is lifted up by a crane (not shown), placed horizontally on the pedestal 1 and clamped as shown in FIGS. The pin 1 of the lower metal hoist 3 suspended from the crane via the wire rope 4 is inserted into the bolt holes 5a, 5a on one side of the
5 and 15 from below, and bring the flat part 5b of the lower metal 5 into contact with the lower side part 13 and the side surface 5c of the lower metal 5 with the inner surface of the middle side part 12, respectively.
is securely held on the lower metal hanging tool 3. Then, the lower metal 5 is lifted up by the crane and moved vertically to the side of the crank pin 2b of the crankshaft 2 to be assembled (see FIG. 4a). continue,
By operating the crane described above, the lower metal 5 is moved laterally to just below the crank pin 2b and then raised. With the lower metal 5 in contact with the crank pin 2b from below, the jack 6' is inserted into the lower end of the lower metal 5, and the screw is screwed. The rod 6'c is extended to securely support the lower metal 5 (see FIG. 4b). Next, the crane is operated to remove the lower metal hanging tool 3 from the lower metal 5 while lowering it, and retreat it to a position where it does not interfere with the next work. Finally, one of the upper metals 7 placed in one place on the floor F is attached to the wire rope 4'.
Then, lift it up with another crane via the eye bolt 17', move it to just above the lower metal 5, place it on the lower metal 5 from above so as to sandwich the crank pin 2b, and bolt the bolts on both sides of the lower metal 5. Nuts 20 are screwed and fastened to the four stud bolts 19 of the upper metal that pass through the holes and protrude from the lower end, thereby connecting the upper metal 7 and the lower metal 5 (see FIG. 4c). The upper metal 7 and lower metal 5 can be assembled to other crank pins 2b in the same manner. Also, according to the reverse procedure as described above,
The connecting rod large end portion (upper metal 7, lower metal 5) can be removed from each crank pin 2b of the crankshaft 2.

In the above embodiment, the lower metal hanging tool 3 is made of light and strong groove-shaped steel, the lower side part 13 is made small and two pins 15, 15 are provided, and the upper side part 11 holds the lower metal 5. The size and shape are designed to maintain balance when the tip of the lower metal 5 is suspended by the eye bolt 17, so it is easy to handle and does not get in the way when moving, allowing for efficient assembly work. Retention will also become more reliable.
In addition, the screw-type jacks 6 and 6' are lightweight and easy to carry, and are made in advance according to the height of the crank pin 2b, so that only a slight adjustment of the threaded rod 6c is required when inserting them, increasing the efficiency of assembly work. goes up.

<Effects of the invention> As is clear from the above explanation, the rod large end assembly jig device of the invention supports the crankshaft horizontally by placing the journal part of the crankshaft immovably. The large end of the connecting rod has a U-shape consisting of a pedestal, an upper side, a middle side, and a lower side, has a hanging part for a crane on the upper side, and has a side surface in contact with the middle side. A lower metal hoist having a pin on the lower side that fits into a bolt hole in the lower metal from below, and a lower metal hoist that is held by the lower metal hoist and lifted up by a crane, and is brought into contact with the crank pin of the crankshaft from below. The lower metal hanger is simple and easy to handle, and the lower metal can be easily and reliably held and moved without damaging the crankshaft due to collision. The lower metal and upper metal of the large end of the connecting rod can be assembled safely and efficiently to the crank pin of the crankshaft, greatly contributing to the assembly work of large internal combustion engines.

[Brief explanation of the drawing]

Fig. 1 is a side view of one embodiment of the present invention, Fig. 2 is a view taken from the - arrow in Fig. 1, Figs. 3 a and b are front and side views of the lower metal hanging tool, and Fig. 4 a ,b,
c is a front view showing an assembly procedure using the above embodiment. 1... Frame, 2... Crankshaft, 2a... Journal portion, 2b... Crank pin, 3... Lower metal hanging tool, 4... Wire rope, 5... Lower metal,
5a, 5a... Bolt hole, 5c... Side, 6,
6'...Jacket, 7...Top metal, 11...Top side, 12...Middle side, 13...Bottom side, 15,
15... Pin, 16... Female thread, 17... Eye bolt, 18... Protective plate, 19... Studded bolt,
20...Natsuto.

Claims (1)

[Scope of utility model registration request] It has a U-shape consisting of a pedestal on which the journal part of the crankshaft is immovably placed and supports the crankshaft horizontally, an upper part, a middle part, and a lower part, and a suspension part for the crane is attached to the upper part of the frame. a lower metal hanger having a pin on the lower side thereof that fits from below into a bolt hole in the lower metal of the large end of the connecting rod whose side surface is in contact with the middle side; and the lower metal hanger. and a jack inserted into the lower end of the lower metal, which is held by the rod and lifted by a crane and brought into contact with the crank pin of the crankshaft from below. .